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Sweep/Control
minimum Gate Delay for fast Gated LO operation. This line is only displayed in Gated LO. You
cannot scroll (knob) or decrement (down key) the Gate Delay to less than that represented by the
position of this line, it can only be set below this position manually, although once there it can be
moved freely with the knob while below the line.
• A yellow line in the Gated Video case only, is displayed at B
length
, where B
length
is the display point
(bucket) length for the swept trace, which is given by the sweep time for that trace divided by number
of Points – 1. So it is referenced to 0 time, not to the delay reference. This line is labeled NEXT PT (it
is not shown in the figure above because the figure above is for Gated LO). The yellow line
represents the edge of a display point (bucket). Normally in Gated Video, the bucket length must be
selected so that it exceeds the off time of the burst. There is another way to use the analyzer in Gated
Video measurements, and that is to set the bucket width much shorter than the off time of the burst.
Then use the Max Hold trace function to fill in "missing" buckets more slowly. This allows you to see
some of the patterns of the Gated Video results earlier, though seeing a completely filled-in spectrum
later.
Gate View Setup
Accesses a menu that enables you to setup parameters relevant to the Gate View
Gate View Sweep Time
Controls the sweep time in the Gate View window. To provide an optimal view of the gate signal, the
analyzer initializes Gate View Sweep Time based on the current settings of Gate Delay and Gate Length.
Key Path: Sweep/Control, Gate
Scope: Meas Global
Initial S/W Revision: A.10.00
Key Path:
Sweep/Control, Gate, Gate View Setup
Remote Command: [:SENSe]:SWEep:EGATe:TIME <time>
[:SENSe]:SWEep:EGATe:TIME?
Example: SWE:EGAT:TIME 500 ms
Dependencies: Gate View Sweep Time is initialized:
• On Preset (after initializing delay and length).
• Every time the Gate Method is set/changed.
Additionally, in the Swept SA measurement, whenever you do a Preset, or
leave Gate View, the analyzer remembers the Gate Delay and Gate Length
settings. Then, when returning to Gate View, if the current Gate Delay and/or
Gate Length do not match the remembered values Gate View Sweep Time is
re-initialized.
1. Compute the location of the "gate stop" line, which you know is at time t =
t
min
+ GateDelay + GateLength.